Add another client config init example

[6r1d]

Rust Guide had a way to initialise the client with more details, second in section 2.
I should add that as well.

use iroha_core::prelude::*;
use iroha_data_model::prelude::*;

let public_str = r#"ed01207233bfc89dcbd68c19fde6ce6158225298ec1131b6a130d1aeb454c1ab5183c0"#;
let private_hex = "9ac47abf59b356e0bd7dcbbbb4dec080e302156a48ca907e47cb6aea1d32719e7233bfc89dcbd68c19fde6ce6158225298ec1131b6a130d1aeb454c1ab5183c0";

let kp = KeyPair::new(
    PublicKey::from_str(public_str)?,
    PrivateKey::from_hex(Algorithm::Ed25519, private_hex.into())?
)?;

let (public_key, private_key) = kp.clone().into();
let account_id: AccountId = "alice@wonderland".parse()?;

let config = ClientConfiguration {
    public_key,
    private_key,
    account_id,
    torii_api_url: SmallStr::from_string(iroha_config::torii::uri::DEFAULT_API_URL.to_owned()),
    ..ClientConfiguration::default()
};